Pityriasis versicolor is the most common of the diseases caused by Malassezia yeasts. The aim of this study is to determine the prevalence of pityriasis versicolor and its etiological aspects in the metropolitan area of Porto Alegre, Brazil. A retrospective cross-sectional study with data from patients of a reference hospital from 1996 to 2011 was performed. Collected data included: date, age, ...

Pityriasis rosea (PR) is a common skin eruption in children that is characterized by a single skin patch that usually evolves into a widespread exanthem after one week. The duration of PR is typically six weeks and the condition is selflimited with excellent prognosis. The diagnosis is established by proper history taking and physical examination of the skin lesions. Laboratory investigations a...

Pityriasis rosea (PR) is a common skin eruption in children that is characterized by a single skin patch that usually evolves into a widespread exanthem after one week. The duration of PR is typically six weeks and the condition is selflimited with excellent prognosis. The diagnosis is established by proper history taking and physical examination of the skin lesions. Laboratory investigations a...

At a debate of the Dermatological Society of London, November 9th, 1898, on general exfoliative dermatitis or pityriasis rubra, Dr. Walter G. Smith1 said that in regard to nomenclature, etymology is a fallible guide in medical terminology, and he did not think it mattered much whether we choose to call it exfoliative dermatitis or pityriasis rubra, except that it would be well we should all agr...

An atypical clinical form of pityriasis versicolor has been infrequently reported, in which cutaneous atrophy is associated with individual pityriasis versicolor lesions. The pathogenesis of this atrophy remains unclear, but is believed to be a delayed-type hypersensitivity reaction to antigens derived from the Malassezia species. A 60-year-old man presented with multiple, slightly scaly, and d...

Dear Editor, Pityriasis rosea is a common, acute, and self-limiting dermatosis, which is associated with the endogenous systemic reactivation of human herpesvirus (HHV)-6 and/or HHV-7 (1). It predominantly affects individuals of both sexes in their second or third decade of life and is clinically characterized by the occurrence of an initial erythematosquamous plaque followed by the appearance ...

Pityriasis rosea (PR) is a common erythemato-squamous dermatosis which almost always, is easily diagnosed. Mostly the disease presents in its classical form. However, clinical dermatology is all about variations and PR is not an exception. Variants of the disease in some cases may be troublesome to diagnose and confuse clinicians. Prompt diagnosis and treatment of the condition becomes necessar...

We present a 74-year-old female patient who developed a pityriasis lichenoides chronica (PLC) during etanercept therapy. This association is not described in the literature and might be considered in the spectrum of cutaneous adverse reactions of etanercept.

Febrile Ulceronecrotic Mucha-Habermann disease is a rare and potentially fatal variant of pityriasis lichenoides et varioliformis acuta and is characterized by high fever, constitutional symptoms, and acute oncet of ulceronecrotic lesions. We present an 11-year-old male with Febrile Ulceronecrotic Mucha-Habermann disease who was cured with methotrexate and review the use of methotrexate for thi...